What is This Feeling

Okay I get this really amazing feeling very rarely, it's triggered by strange touch or sound. It feels like a halo around my head and it's the greatest thing I've ever felt. It just feels so amazing. Any clue what this is?

"It feels like a halo around my head and it's the greatest thing I've ever felt."

I wouldn't necessarily question it because you've stated it's a good thing? If it's not a problem.

As far as the temporal pattern you've described. More than likely it's nothing vestibular related or a physical anomaly. You've given no reference for a particular stimulus. What type of sound? Intensity, duration, frequency?

Psychological phenomenon - kinda like the phenomenon of perfect pitch.